Valve for internal-combustion engines



G. W. DAVIS VALVE FOR INTERNAL COMBUSTION ENGINES Filed Jan. 25 1921 2 Sheets-Sheet l INVENTOR WITNSS ATTORNEY Oct. 21 1924. 1,512,525

G. w. DAVIS VALVE FOR INTERNAL COMBUSTION ENGINES Filed Jan. 25. 1921 2 Sheets-Sheet 2 Ra ORR;

a 144,062 W's INVENTOR ATTORNEY Patented Oct. 21, 1924.

UNITED STATES PATENT OFFICE.

VALVE FOR INTERNAL-COMBUSTION ENGINES.

Application filed January 25, 1921.

To all whom it may concern:

Be it known that I, GEORGE W. DAVIS, a citizen of the United States, residing in the city of Baltimore and State of Maryland, have invented new and useful Improvements in Valves for Internal-Combustion Engines, of which the following is a specification.

This invention relates to rotary valves for internal combustion engines, the general object of the invention being to provide a valve of hollow construction for permitting air or water to be passed through it for cooling purposes, the air or water after passing through the valve being usable, if desired, for assisting the vaporization of the fuel.

A further object of the invention is to provide means for cooling the valve both internally and exteriorly by either water or air.

A still further object of the invention is to provide means whereby the valve will control both the inlet and exhaust ports of the cylinder and to provide the valve with an emergency port for the escape of pressure caused by explosions in the valve passage.

A further object of the invention is to provide means for connecting the valves of each cylinder together in such a maner as to offset any irregularities of the cylinders caused by the expansion or contraction thereof or in any other way.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a plan view of an engine supplied with my invention.

Figure 2 is an enlarged longitudinal sec tion through the valve of one cylinder.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4 is a section on line 44 of Figure 1.

Figure 5 is a view of the valve seat.

Figure 6 is a view of one of the clutches.

In these views A indicates the engine and Serial No. 439,830.

B indicates my improved valve means connected therew1th. The valve for each cylinder comprises a casing 1, containing a valve seat 2, for the valve sleeve 3. The casmg provides a water jacket between itself and the valve seat and this jacket may be connected with the Water jacket of the engine in any desired manner, or water may be supplied to the jacket in.other ways if desired. The exterior walls of the casing maybe provided with fins or the like (not shown) to facilitate the cooling of the valve parts by the air. The casing is provided with the inlet passage 4 which is connected with the inlet manifold, and with the outlet port 5 which is connected with the exhaust manifold. The bottom of the casing is also provided with the inlet port 4' and the outlet port 5 through which the explosive charge enters the cylinder of the engine and the exhaust passes from the cylinder into the valve. The valve seat 2 is also provided with the inlet ports 6 and 6' and the outlet ports 7 and 7 which register with the ports in the casing and the valve sleeve 3 is provided with a transverse passage 8 through which the explosive mixture and the exhaust gases will pass. The walls of this passage are so formed as to leave a space at each side the interior of the sleeve through which the cooling air or water may pass on its way through the sleeve. An emergency exhaust port 10 is formed in the casing and valve seat, the port entering the valve seat at one side thereof and is arranged adjacent the outlet port 7. This port will register with the passage 8 in the sleeve during the ignition stroke so that if an explosion should occur in the said passage in the sleeve the pressure would escape through the emergency port.

The bore of the valve seat is provided with the oil grooves 11 which are supplied with oil through the ports 12 which extend through the casing and valve seat. Bridge pieces 13 are arran ed i the ports 6 and 6' and 7 and 7' an the central oil groove extends through these bridge pieces and similar bridge pieces 14 are placed in the passage 8 in the sleeve for covering the central groove. By this arrangement the parts of the valve which are subjected to the greatest heat are sup lied w1th lubricant. The sleeve is provided with the rin 15. I prefer to so arrange the auxiliary ex aust port and the main exhaust port 7 that the passage 8 will be in communication with the port 7 before It is clear of port 10 thus the exhaust will be open from the time the passage registers with the auxiliary port 10 until it passes the .main exhaust 5.

The valve sleeve is rotated by means of the hollow shaft 16 which is provided with the gear 17 which is suitably connected with the crank shaft and this shaft is connected with the sleeve by the jaw clutches 18. The rear end of the sleeve may be connected with the sleeve of the next cylinder by means of the coupling sleeve 19 which is also connected with the two-sleeves by jaw clutches 18. I prefer to make the sleeves and valve seats of tapered sha e, as shown in the drawing. I also provi e a hollow screw shaft 20 located in the frame 21 and abuttin the end of the shaft 16 for taking up end play of the sleeve.

From the above it will be seen that the rotary movement of the valve sleeve will control both the inlet and exhaust passages of the cylinder and the emergency exhaust ort will take care of the pressure produced y an explosion in the passage in the sleeve. The valve parts are kept cool by the water in the jackets and the air passing throu h the hollow sleeves, the hollow shaft and t e hollow set screw and coupling. As before stated this air may be led to the carbureter (not shown) so as to assist in the vaporization of the fuel. In this case the speed of the engine will automatically control the flow of cooling air through the valve parts as the greater the speed the more air will pass through said parts. The valve parts are also thoroughly lubricated and the bridges afford means for lubricating the parts of the valve which are subjected to the greatest heat and the use of the coupling sleeves 19 between the valve sleeves will prevent any irregularities in the cylinders from interfering with the operation of the valves as said sleeves will compensate for the disalignment of the valve parts.

The interior walls of the valve sleeves may have fins or the like (not shown) thereon for facilitating the cooling of the sleeve by the air or water passing therethrough.

' the sleeve, said Ifdesired either ball or roller bearings ma .be provided for the valve sleeve.

iile the drawin s show the valve parts as formed separatel one for each cylinder, it will of course be understood that a single valve sleeve may be arranged for controlling the inlet and exhaust ports of all the cylinders and it may be either tapered or straight.

It is thought from the foregoin tion that the advantages and nove of my invention will descripfeatures be readily a parent.

I desire it to be understood t at I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What I claim is A rotary valve for an internal combustion engine comprising a casing having inlet and exhaust ports therein, a valve seat arranged in the casing and spaced therefrom to form a water receiving space, said seat having inlet and exhaust ports which register with the ports in the casing, and said seat and casing each having an auxiliary exhaust port, a tapered valve sleeve engagin the seat and havin a transverse passage t erein for cooperating with the ports, said passage being wider than the wall which separates the auxiliary exhaust port from the main exhaust port, the walls of said transverse passage leaving a s ace between themselves and the outer we of the sleeve for the passage of a cooling medium, means for supplying lubricant between the sleeve and seat, such means including bridge pieces in the ports and passages and grooves in the casing walls and in the valve seat, portions of which are formed in the bridge pieces, a hollow screw shaft, a screw threaded support for the same, means for rotating the valve sleeve, such means including a gear clutching] coupled to the sleeve and enga ed by the ollow shaft, said hollow shaft hoIding said gear clutched with gear having a bore which is in alignment with the bore of the sleeve and the hollow shaft.

In testimony whereof I ailix my si ature.

GEORGE W. D V18. 

